scholarly journals Physiological and Molecular Analysis of Aluminium-Induced Organic Acid Anion Secretion from Grain Amaranth (Amaranthus hypochondriacus L.) Roots

2016 ◽  
Vol 17 (5) ◽  
pp. 608 ◽  
Author(s):  
Wei Fan ◽  
Jia-Meng Xu ◽  
He-Qiang Lou ◽  
Chuan Xiao ◽  
Wei-Wei Chen ◽  
...  
Keyword(s):  
Organic Acid ◽  
Molecular Analysis ◽  
Acid Anion ◽  
Grain Amaranth ◽  
Amaranthus Hypochondriacus ◽  
Anion Secretion ◽  
Organic Acid Anion

scholarly journals Roles of Organic Acid Anion Secretion in Aluminium Tolerance of Higher Plants

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Lin-Tong Yang ◽  
Yi-Ping Qi ◽  
Huan-Xin Jiang ◽  
Li-Song Chen
Keyword(s):  
Organic Acid ◽  
Higher Plants ◽  
Crop Productivity ◽  
Aluminium Tolerance ◽  
Anion Channels ◽  
Al Tolerance ◽  
Anion Secretion ◽  
Organic Acid Anion ◽  
The Tropics ◽  
Root Plasma Membrane

Approximately 30% of the world’s total land area and over 50% of the world’s potential arable lands are acidic. Furthermore, the acidity of the soils is gradually increasing as a result of the environmental problems including some farming practices and acid rain. At mildly acidic or neutral soils, aluminium(Al) occurs primarily as insoluble deposits and is essentially biologically inactive. However, in many acidic soils throughout the tropics and subtropics, Al toxicity is a major factor limiting crop productivity. The Al-induced secretion of organic acid (OA) anions, mainly citrate, oxalate, and malate, from roots is the best documented mechanism of Al tolerance in higher plants. Increasing evidence shows that the Al-induced secretion of OA anions may be related to the following several factors, including (a) anion channels or transporters, (b) internal concentrations of OA anions in plant tissues, (d) temperature, (e) root plasma membrane (PM) H+-ATPase, (f) magnesium (Mg), and (e) phosphorus (P). Genetically modified plants and cells with higher Al tolerance by overexpressing genes for the secretion and the biosynthesis of OA anions have been obtained. In addition, some aspects needed to be further studied are also discussed.

scholarly journals Imidazolium-type anion exchange membranes for improved organic acid transport and permselectivity in electrodialysis

2022 ◽  
Author(s):  
Matthew Jordan ◽  
Tanmay Kulkarni ◽  
Dodangodage Senadheera ◽  
Revati Kumar ◽  
Yupo Lin ◽  
...  
Keyword(s):  
Organic Acid ◽  
Anion Exchange ◽  
Quaternary Ammonium ◽  
Anion Exchange Membranes ◽  
Acid Transport ◽  
Acid Anion ◽  
Imidazolium Cations ◽  
Organic Acid Anion ◽  
2D Noesy ◽  
Organic Acid Transport

Abstract Most commercial anion exchange membranes (AEMs) deploy quaternary ammonium moieties. Alternative cation moieties have been explored in AEMs for fuel cells, but there are no studies focused examining alternative tethered cations in AEMs for ionic separations – such as organic acid anion transport via electrodialysis. H-cell and conductivity experiments demonstrate that tethered benzyl 1-methyl imidazolium groups in polysulfone AEMs enhance lactate conductivity by 49% and improved lactate anion flux by 24x when compared to a quaternary benzyl ammonium polysulfone AEM. An electrodialysis demonstration with the imidazolium-type AEM showed a 2x improvement in lactate anion flux and 20% improvement in permselectivity when benchmarked against the quaternary ammonium AEM. Molecular dynamics and 2D NOESY NMR revealed closer binding of lactate anions to the imidazolium cations when compared to the quaternary ammonium cation. It is posited that this closer binding is responsible to greater flux values observed with imidazolium-type AEM.

scholarly journals Nutrient Uptake and Organic Acid Anion Metabolism in Lupins and Peas Supplied with Nitrate

1994 ◽  
Vol 74 (1) ◽  
pp. 69-74 ◽  
Author(s):  
S. P. Loss ◽  
A. D. Robson ◽  
G. S. P. Ritchie
Keyword(s):  
Organic Acid ◽  
Nutrient Uptake ◽  
Acid Anion ◽  
Organic Acid Anion
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